关键词: 节理岩体, 岩体结构, 岩质边坡, 稳定性分析, 强度折减法, 非线性有限元

Abstract: In case of rocky slope, the strength reduction coefficient method adopts reduced geomaterial parameters in the slope excavation calculation.The initial ground stress calculation is different from that for slope initial state and the calculation process is not in conformity with the definition of strength safety factor.An improved strength reduction coefficient method is proposed, which takes a full consideration of the impact of the initial ground stress of rocky slope, making the safety factor obtained more conforming to the reality.In the stability analysis for the jointed rocky slope of Jiujiapeng Bridge in Sichuan, the improved strength reduction coefficient method is used.The proposed method is used to analyze the stability of the bolting support of the rocky slope at the side of Lixian of Jiujiapeng Bridge.The analysis result indicates that the bolting-strengthened jointed slope has a small plastic area and a safety factor of 1.2, and the rocky slope under the support is in a stable state.

Key words: Jointed rock mass, Rock mass structure, Rocky slope, Stability analysis, Strength reduction method, Nonlinear finite element